from ..logging import log
from . import query as qmod
-# pylint: disable=too-many-return-statements,too-many-branches
@dataclasses.dataclass
class TypedRange:
TypedRangeSeq = List[TypedRange]
+
@dataclasses.dataclass
-class TokenAssignment: # pylint: disable=too-many-instance-attributes
+class TokenAssignment:
""" Representation of a possible assignment of token types
to the tokens in a tokenized query.
"""
near_item: Optional[qmod.TokenRange] = None
qualifier: Optional[qmod.TokenRange] = None
-
@staticmethod
def from_ranges(ranges: TypedRangeSeq) -> 'TokenAssignment':
""" Create a new token assignment from a sequence of typed spans.
self.direction = direction
self.penalty = penalty
-
def __str__(self) -> str:
seq = ''.join(f'[{r.trange.start} - {r.trange.end}: {r.ttype.name}]' for r in self.seq)
return f'{seq} (dir: {self.direction}, penalty: {self.penalty})'
-
@property
def end_pos(self) -> int:
""" Return the index of the global end of the current sequence.
"""
return self.seq[-1].trange.end if self.seq else 0
-
def has_types(self, *ttypes: qmod.TokenType) -> bool:
""" Check if the current sequence contains any typed ranges of
the given types.
"""
return any(s.ttype in ttypes for s in self.seq)
-
def is_final(self) -> bool:
""" Return true when the sequence cannot be extended by any
form of token anymore.
"""
# Country and category must be the final term for left-to-right
return len(self.seq) > 1 and \
- self.seq[-1].ttype in (qmod.TokenType.COUNTRY, qmod.TokenType.NEAR_ITEM)
-
+ self.seq[-1].ttype in (qmod.TokenType.COUNTRY, qmod.TokenType.NEAR_ITEM)
def appendable(self, ttype: qmod.TokenType) -> Optional[int]:
""" Check if the give token type is appendable to the existing sequence.
return None
if len(self.seq) > 2 \
or self.has_types(qmod.TokenType.POSTCODE, qmod.TokenType.COUNTRY):
- return None # direction left-to-right: housenumber must come before anything
- elif self.direction == -1 \
- or self.has_types(qmod.TokenType.POSTCODE, qmod.TokenType.COUNTRY):
- return -1 # force direction right-to-left if after other terms
+ return None # direction left-to-right: housenumber must come before anything
+ elif (self.direction == -1
+ or self.has_types(qmod.TokenType.POSTCODE, qmod.TokenType.COUNTRY)):
+ return -1 # force direction right-to-left if after other terms
return self.direction
return None
-
def advance(self, ttype: qmod.TokenType, end_pos: int,
btype: qmod.BreakType) -> Optional['_TokenSequence']:
""" Return a new token sequence state with the given token type
return _TokenSequence(newseq, newdir, self.penalty + new_penalty)
-
def _adapt_penalty_from_priors(self, priors: int, new_dir: int) -> bool:
if priors >= 2:
if self.direction == 0:
return True
-
def recheck_sequence(self) -> bool:
""" Check that the sequence is a fully valid token assignment
and adapt direction and penalties further if necessary.
return True
-
def _get_assignments_postcode(self, base: TokenAssignment,
- query_len: int) -> Iterator[TokenAssignment]:
+ query_len: int) -> Iterator[TokenAssignment]:
""" Yield possible assignments of Postcode searches with an
address component.
"""
# <address>,<postcode> should give preference to address search
if base.postcode.start == 0:
penalty = self.penalty
- self.direction = -1 # name searches are only possible backwards
+ self.direction = -1 # name searches are only possible backwards
else:
penalty = self.penalty + 0.1
- self.direction = 1 # name searches are only possible forwards
+ self.direction = 1 # name searches are only possible forwards
yield dataclasses.replace(base, penalty=penalty)
-
def _get_assignments_address_forward(self, base: TokenAssignment,
query: qmod.QueryStruct) -> Iterator[TokenAssignment]:
""" Yield possible assignments of address searches with
yield dataclasses.replace(base, name=name, address=[addr] + base.address[1:],
penalty=penalty + PENALTY_TOKENCHANGE[query.nodes[i].btype])
-
def _get_assignments_address_backward(self, base: TokenAssignment,
query: qmod.QueryStruct) -> Iterator[TokenAssignment]:
""" Yield possible assignments of address searches with
yield dataclasses.replace(base, name=name, address=base.address[:-1] + [addr],
penalty=penalty + PENALTY_TOKENCHANGE[query.nodes[i].btype])
-
def get_assignments(self, query: qmod.QueryStruct) -> Iterator[TokenAssignment]:
""" Yield possible assignments for the current sequence.
projects / nominatim.git / blobdiff